Merging upstream version 1.12.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

20 files changed, 155 insertions, 3276 deletions

diff --git a/web/server/Makefile.am b/web/server/Makefile.am
index 843c4cc9b..5860a5cba 100644
--- a/web/server/Makefile.am
+++ b/web/server/Makefile.am
@@ -4,8 +4,6 @@ AUTOMAKE_OPTIONS = subdir-objects
 MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
 
 SUBDIRS = \
-    single \
-    multi \
     static \
     $(NULL)
 
diff --git a/web/server/Makefile.in b/web/server/Makefile.in
deleted file mode 100644
index 4b2614c5a..000000000
--- a/web/server/Makefile.in
+++ /dev/null
@@ -1,650 +0,0 @@
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diff --git a/web/server/README.md b/web/server/README.md
index 34ef628bc..7d74c181e 100644
--- a/web/server/README.md
+++ b/web/server/README.md
@@ -1,34 +1,21 @@
-# Netdata web server
+# Web server
 
-Netdata supports 3 implementations of its internal web server:
-
-- `static-threaded` is a web server with a fix (configured number of threads)
-- `single-threaded` is a simple web server running with a single thread
-- `multi-threaded` is a web server that spawns a thread for each client connection
-- `none` to disable the web server
-
-We suggest to use the `static-threaded` one. It is the most efficient.
-
-All versions of the web servers use non-blocking I/O.
-
-All web servers respect the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection.
+The Netdata web server runs as `static-threaded`, i.e. with a fixed, configurable number of threads.
+It uses non-blocking I/O and respects the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection.
 
 ## Configuration
 
-### Selecting the web server
-
-You can select the web server implementation by editing `netdata.conf` and setting:
+You can disable the web server by editing `netdata.conf` and setting:
 
 ```
 [web]
-    mode = none | single-threaded | multi-threaded | static-threaded
+    mode = none
 ```
 
-The `static` web server supports also these settings:
+With the web server enabled, you can control the number of threads and sockets with the following settings:
 
 ```
 [web]
-    mode = static-threaded
     web server threads = 4
     web server max sockets = 512
 ```
@@ -39,28 +26,37 @@ The `web server max sockets` setting is automatically adjusted to 50% of the max
 
 ### Binding netdata to multiple ports
 
-Netdata can bind to multiple IPs and ports. Up to 100 sockets can be used (you can increase it at compile time with `CFLAGS="-DMAX_LISTEN_FDS=200" ./netdata-installer.sh ...`).
+Netdata can bind to multiple IPs and ports, offering access to different services on each. Up to 100 sockets can be used (you can increase it at compile time with `CFLAGS="-DMAX_LISTEN_FDS=200" ./netdata-installer.sh ...`).
 
 The ports to bind are controlled via `[web].bind to`, like this:
 
 ```
 [web]
    default port = 19999
-   bind to = 127.0.0.1 10.1.1.1:19998 hostname:19997 [::]:19996 localhost:19995 *:http unix:/tmp/netdata.sock
+   bind to = 127.0.0.1=dashboard 10.1.1.1:19998=management|netdata.conf hostname:19997=badges [::]:19996=streaming localhost:19995=registry *:http=dashboard unix:/tmp/netdata.sock
 ```
 
 Using the above, netdata will bind to:
 
-- IPv4 127.0.0.1 at port 19999 (port was used from `default port`)
-- IPv4 10.1.1.1 at port 19998
-- All the IPs `hostname` resolves to (both IPv4 and IPv6 depending on the resolved IPs) at port 19997
-- All IPv6 IPs at port 19996
-- All the IPs `localhost` resolves to (both IPv4 and IPv6 depending the resolved IPs) at port 19996
-- All IPv4 and IPv6 IPs at port `http` as set in `/etc/services`
-- Unix domain socket `/tmp/netdata.sock`
+- IPv4 127.0.0.1 at port 19999 (port was used from `default port`). Only the UI (dashboard) and the read API will be accessible on this port. 
+- IPv4 10.1.1.1 at port 19998. The management API and netdata.conf will be accessible on this port.
+- All the IPs `hostname` resolves to (both IPv4 and IPv6 depending on the resolved IPs) at port 19997. Only badges will be accessible on this port.
+- All IPv6 IPs at port 19996. Only metric streaming requests from other netdata agents will be accepted on this port.
+- All the IPs `localhost` resolves to (both IPv4 and IPv6 depending the resolved IPs) at port 19996. This port will only accept registry API requests.
+- All IPv4 and IPv6 IPs at port `http` as set in `/etc/services`. Only the UI (dashboard) and the read API will be accessible on this port. 
+- Unix domain socket `/tmp/netdata.sock`. All requests are serviceable on this socket.
 
 The option `[web].default port` is used when an entries in `[web].bind to` do not specify a port.
 
+Note that the access permissions specified with the `=request type|request type|...` format are available from version 1.12 onwards. 
+As shown in the example above, these permissions are optional, with the default being to permit all request types on the specified port. 
+The request types are strings identical to the `allow X from` directives of the access lists, i.e. `dashboard`, `streaming`, `registry`, `netdata.conf`, `badges` and `management`. 
+The access lists themselves and the general setting `allow connections from` in the next section are applied regardless of the ports that are configured to provide these services. 
+The API requests are serviced as follows:
+- `dashboard` gives access to the UI, the read API and badges API calls.
+- `badges` gives access only to the badges API calls.
+- `management` gives access only to the management API calls.
+
 ### Access lists
 
 Netdata supports access lists in `netdata.conf`:
@@ -72,6 +68,7 @@ Netdata supports access lists in `netdata.conf`:
 	allow badges from = *
 	allow streaming from = *
 	allow netdata.conf from = localhost fd* 10.* 192.168.* 172.16.* 172.17.* 172.18.* 172.19.* 172.20.* 172.21.* 172.22.* 172.23.* 172.24.* 172.25.* 172.26.* 172.27.* 172.28.* 172.29.* 172.30.* 172.31.*
+	allow management from = localhost
 ```
 
 `*` does string matches on the IPs of the clients.
@@ -90,7 +87,27 @@ Netdata supports access lists in `netdata.conf`:
    The setting in `netdata.conf` is checked before the ones in [stream.conf](../../streaming/stream.conf).
 
 - `allow netdata.conf from` checks the IP to allow `http://netdata.host:19999/netdata.conf`.
-   By default it allows only private lans.
+   The IPs listed are all the private IPv4 addresses, including link local IPv6 addresses. Keep in mind that connections to netdata API ports are filtered by `allow connections from`. So, IPs allowed by `allow netdata.conf from` should also be allowed by `allow connections from`.
+
+- `allow management from` checks the IPs to allow API management calls. Management via the API is currently supported for [health](../api/health/#health-management-api)
+
+### Other netdata.conf [web] section options
+setting | default | info
+:------:|:-------:|:----
+ses max window | `15` | See [single exponential smoothing](../api/queries/des/)
+des max window | `15` | See [double exponential smoothing](../api/queries/des/)
+listen backlog | `4096` | The port backlog. Check `man 2 listen`.  
+web files owner | `netdata` | The user that owns the web static files. Netdata will refuse to serve a file that is not owned by this user, even if it has read access to that file. If the user given is not found, netdata will only serve files owned by user given in `run as user`. 
+web files group | `netdata` | If this is set, Netdata will check if the file is owned by this group and refuse to serve the file if it's not.
+disconnect idle clients after seconds | `60` | The time in seconds to disconnect web clients after being totally idle. 
+timeout for first request | `60` | How long to wait for a client to send a request before closing the socket. Prevents slow request attacks.
+accept a streaming request every seconds | `0` | Can be used to set a limit on how often a master Netdata server will accept streaming requests from the slaves in a [streaming and replication setup](../../streaming)
+respect do not track policy | `no` | If set to `yes`, will respect the client's browser preferences on storing cookies. 
+x-frame-options response header |  | [Avoid clickjacking attacks, by ensuring that the content is not embedded into other sites](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options).
+enable gzip compression | `yes` | When set to `yes`, netdata web responses will be GZIP compressed, if the web client accepts such responses. 
+gzip compression strategy | `default` | Valid strategies are `default`, `filtered`, `huffman only`, `rle` and `fixed`
+gzip compression level | `3` | Valid levels are 1 (fastest) to 9 (best ratio)
+
 
 ## DDoS protection
 
@@ -101,3 +118,6 @@ If you publish your netdata to the internet, you may want to apply some protecti
 3. Don't use all your cpu cores for netdata (lower `[web].web server threads`)
 4. Run netdata with a low process scheduling priority (the default is the lowest)
 5. If possible, proxy netdata via a full featured web server (nginx, apache, etc)
+
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fweb%2Fserver%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/web/server/multi/Makefile.am b/web/server/multi/Makefile.am
deleted file mode 100644
index 90cc9ca1e..000000000
--- a/web/server/multi/Makefile.am
+++ /dev/null
@@ -1,11 +0,0 @@
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-
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diff --git a/web/server/multi/Makefile.in b/web/server/multi/Makefile.in
deleted file mode 100644
index 61ef9455f..000000000
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+++ /dev/null
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diff --git a/web/server/multi/README.md b/web/server/multi/README.md
deleted file mode 100644
index f51073e93..000000000
--- a/web/server/multi/README.md
+++ /dev/null
@@ -1,8 +0,0 @@
-# `multi-threaded` web server
-
-The `multi-threaded` web server spawns a thread for each connection it receives.
-
-Each thread uses non-blocking I/O so it can serve any number of web requests in parallel,
-though this is not supported by HTTP, so in practice each thread serves all the requests sequentially.
-
-Each thread respects the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection. 
\ No newline at end of file
diff --git a/web/server/multi/multi-threaded.c b/web/server/multi/multi-threaded.c
deleted file mode 100644
index 37bdd38ad..000000000
--- a/web/server/multi/multi-threaded.c
+++ /dev/null
@@ -1,314 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#define WEB_SERVER_INTERNALS 1
-#include "multi-threaded.h"
-
-// --------------------------------------------------------------------------------------
-// the thread of a single client - for the MULTI-THREADED web server
-
-// 1. waits for input and output, using async I/O
-// 2. it processes HTTP requests
-// 3. it generates HTTP responses
-// 4. it copies data from input to output if mode is FILECOPY
-
-int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
-int web_client_first_request_timeout = DEFAULT_TIMEOUT_TO_RECEIVE_FIRST_WEB_REQUEST;
-long web_client_streaming_rate_t = 0L;
-
-static void multi_threaded_web_client_worker_main_cleanup(void *ptr) {
-    struct web_client *w = ptr;
-    WEB_CLIENT_IS_DEAD(w);
-    w->running = 0;
-}
-
-static void *multi_threaded_web_client_worker_main(void *ptr) {
-    netdata_thread_cleanup_push(multi_threaded_web_client_worker_main_cleanup, ptr);
-
-            struct web_client *w = ptr;
-            w->running = 1;
-
-            struct pollfd fds[2], *ifd, *ofd;
-            int retval, timeout_ms;
-            nfds_t fdmax = 0;
-
-            while(!netdata_exit) {
-                if(unlikely(web_client_check_dead(w))) {
-                    debug(D_WEB_CLIENT, "%llu: client is dead.", w->id);
-                    break;
-                }
-                else if(unlikely(!web_client_has_wait_receive(w) && !web_client_has_wait_send(w))) {
-                    debug(D_WEB_CLIENT, "%llu: client is not set for neither receiving nor sending data.", w->id);
-                    break;
-                }
-
-                if(unlikely(w->ifd < 0 || w->ofd < 0)) {
-                    error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd", w->id, w->ifd, w->ofd);
-                    break;
-                }
-
-                if(w->ifd == w->ofd) {
-                    fds[0].fd = w->ifd;
-                    fds[0].events = 0;
-                    fds[0].revents = 0;
-
-                    if(web_client_has_wait_receive(w)) fds[0].events |= POLLIN;
-                    if(web_client_has_wait_send(w))    fds[0].events |= POLLOUT;
-
-                    fds[1].fd = -1;
-                    fds[1].events = 0;
-                    fds[1].revents = 0;
-
-                    ifd = ofd = &fds[0];
-
-                    fdmax = 1;
-                }
-                else {
-                    fds[0].fd = w->ifd;
-                    fds[0].events = 0;
-                    fds[0].revents = 0;
-                    if(web_client_has_wait_receive(w)) fds[0].events |= POLLIN;
-                    ifd = &fds[0];
-
-                    fds[1].fd = w->ofd;
-                    fds[1].events = 0;
-                    fds[1].revents = 0;
-                    if(web_client_has_wait_send(w))    fds[1].events |= POLLOUT;
-                    ofd = &fds[1];
-
-                    fdmax = 2;
-                }
-
-                debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, web_client_has_wait_receive(w)?"INPUT":"", web_client_has_wait_send(w)?"OUTPUT":"");
-                errno = 0;
-                timeout_ms = web_client_timeout * 1000;
-                retval = poll(fds, fdmax, timeout_ms);
-
-                if(unlikely(netdata_exit)) break;
-
-                if(unlikely(retval == -1)) {
-                    if(errno == EAGAIN || errno == EINTR) {
-                        debug(D_WEB_CLIENT, "%llu: EAGAIN received.", w->id);
-                        continue;
-                    }
-
-                    debug(D_WEB_CLIENT, "%llu: LISTENER: poll() failed (input fd = %d, output fd = %d). Closing client.", w->id, w->ifd, w->ofd);
-                    break;
-                }
-                else if(unlikely(!retval)) {
-                    debug(D_WEB_CLIENT, "%llu: Timeout while waiting socket async I/O for %s %s", w->id, web_client_has_wait_receive(w)?"INPUT":"", web_client_has_wait_send(w)?"OUTPUT":"");
-                    break;
-                }
-
-                if(unlikely(netdata_exit)) break;
-
-                int used = 0;
-                if(web_client_has_wait_send(w) && ofd->revents & POLLOUT) {
-                    used++;
-                    if(web_client_send(w) < 0) {
-                        debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
-                        break;
-                    }
-                }
-
-                if(unlikely(netdata_exit)) break;
-
-                if(web_client_has_wait_receive(w) && (ifd->revents & POLLIN || ifd->revents & POLLPRI)) {
-                    used++;
-                    if(web_client_receive(w) < 0) {
-                        debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
-                        break;
-                    }
-
-                    if(w->mode == WEB_CLIENT_MODE_NORMAL) {
-                        debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
-                        web_client_process_request(w);
-
-                        // if the sockets are closed, may have transferred this client
-                        // to plugins.d
-                        if(unlikely(w->mode == WEB_CLIENT_MODE_STREAM))
-                            break;
-                    }
-                }
-
-                if(unlikely(!used)) {
-                    debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on socket.", w->id);
-                    break;
-                }
-            }
-
-            if(w->mode != WEB_CLIENT_MODE_STREAM)
-                web_server_log_connection(w, "DISCONNECTED");
-
-            web_client_request_done(w);
-
-            debug(D_WEB_CLIENT, "%llu: done...", w->id);
-
-            // close the sockets/files now
-            // to free file descriptors
-            if(w->ifd == w->ofd) {
-                if(w->ifd != -1) close(w->ifd);
-            }
-            else {
-                if(w->ifd != -1) close(w->ifd);
-                if(w->ofd != -1) close(w->ofd);
-            }
-            w->ifd = -1;
-            w->ofd = -1;
-
-    netdata_thread_cleanup_pop(1);
-    return NULL;
-}
-
-// --------------------------------------------------------------------------------------
-// the main socket listener - MULTI-THREADED
-
-// 1. it accepts new incoming requests on our port
-// 2. creates a new web_client for each connection received
-// 3. spawns a new netdata_thread to serve the client (this is optimal for keep-alive clients)
-// 4. cleans up old web_clients that their netdata_threads have been exited
-
-static void web_client_multi_threaded_web_server_release_clients(void) {
-    struct web_client *w;
-    for(w = web_clients_cache.used; w ; ) {
-        if(unlikely(!w->running && web_client_check_dead(w))) {
-            struct web_client *t = w->next;
-            web_client_release(w);
-            w = t;
-        }
-        else
-            w = w->next;
-    }
-}
-
-static void web_client_multi_threaded_web_server_stop_all_threads(void) {
-    struct web_client *w;
-
-    int found = 1;
-    usec_t max = 2 * USEC_PER_SEC, step = 50000;
-    for(w = web_clients_cache.used; w ; w = w->next) {
-        if(w->running) {
-            found++;
-            info("stopping web client %s, id %llu", w->client_ip, w->id);
-            netdata_thread_cancel(w->thread);
-        }
-    }
-
-    while(found && max > 0) {
-        max -= step;
-        info("Waiting %d web threads to finish...", found);
-        sleep_usec(step);
-        found = 0;
-        for(w = web_clients_cache.used; w ; w = w->next)
-            if(w->running) found++;
-    }
-
-    if(found)
-        error("%d web threads are taking too long to finish. Giving up.", found);
-}
-
-static struct pollfd *socket_listen_main_multi_threaded_fds = NULL;
-
-static void socket_listen_main_multi_threaded_cleanup(void *data) {
-    struct netdata_static_thread *static_thread = (struct netdata_static_thread *)data;
-    static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
-
-    info("cleaning up...");
-
-    info("releasing allocated memory...");
-    freez(socket_listen_main_multi_threaded_fds);
-
-    info("closing all sockets...");
-    listen_sockets_close(&api_sockets);
-
-    info("stopping all running web server threads...");
-    web_client_multi_threaded_web_server_stop_all_threads();
-
-    info("freeing web clients cache...");
-    web_client_cache_destroy();
-
-    info("cleanup completed.");
-    static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
-}
-
-#define CLEANUP_EVERY_EVENTS 60
-void *socket_listen_main_multi_threaded(void *ptr) {
-    netdata_thread_cleanup_push(socket_listen_main_multi_threaded_cleanup, ptr);
-
-            web_server_mode = WEB_SERVER_MODE_MULTI_THREADED;
-            web_server_is_multithreaded = 1;
-
-            struct web_client *w;
-            int retval, counter = 0;
-
-            if(!api_sockets.opened)
-                fatal("LISTENER: No sockets to listen to.");
-
-            socket_listen_main_multi_threaded_fds = callocz(sizeof(struct pollfd), api_sockets.opened);
-
-            size_t i;
-            for(i = 0; i < api_sockets.opened ;i++) {
-                socket_listen_main_multi_threaded_fds[i].fd = api_sockets.fds[i];
-                socket_listen_main_multi_threaded_fds[i].events = POLLIN;
-                socket_listen_main_multi_threaded_fds[i].revents = 0;
-
-                info("Listening on '%s'", (api_sockets.fds_names[i])?api_sockets.fds_names[i]:"UNKNOWN");
-            }
-
-            int timeout_ms = 1 * 1000;
-
-            while(!netdata_exit) {
-
-                // debug(D_WEB_CLIENT, "LISTENER: Waiting...");
-                retval = poll(socket_listen_main_multi_threaded_fds, api_sockets.opened, timeout_ms);
-
-                if(unlikely(retval == -1)) {
-                    error("LISTENER: poll() failed.");
-                    continue;
-                }
-                else if(unlikely(!retval)) {
-                    debug(D_WEB_CLIENT, "LISTENER: poll() timeout.");
-                    counter++;
-                    continue;
-                }
-
-                for(i = 0 ; i < api_sockets.opened ; i++) {
-                    short int revents = socket_listen_main_multi_threaded_fds[i].revents;
-
-                    // check for new incoming connections
-                    if(revents & POLLIN || revents & POLLPRI) {
-                        socket_listen_main_multi_threaded_fds[i].revents = 0;
-
-                        w = web_client_create_on_listenfd(socket_listen_main_multi_threaded_fds[i].fd);
-                        if(unlikely(!w)) {
-                            // no need for error log - web_client_create_on_listenfd already logged the error
-                            continue;
-                        }
-
-                        if(api_sockets.fds_families[i] == AF_UNIX)
-                            web_client_set_unix(w);
-                        else
-                            web_client_set_tcp(w);
-
-                        char tag[NETDATA_THREAD_TAG_MAX + 1];
-                        snprintfz(tag, NETDATA_THREAD_TAG_MAX, "WEB_CLIENT[%llu,[%s]:%s]", w->id, w->client_ip, w->client_port);
-
-                        w->running = 1;
-                        if(netdata_thread_create(&w->thread, tag, NETDATA_THREAD_OPTION_DONT_LOG, multi_threaded_web_client_worker_main, w) != 0) {
-                            w->running = 0;
-                            web_client_release(w);
-                        }
-                    }
-                }
-
-                counter++;
-                if(counter > CLEANUP_EVERY_EVENTS) {
-                    counter = 0;
-                    web_client_multi_threaded_web_server_release_clients();
-                }
-            }
-
-    netdata_thread_cleanup_pop(1);
-    return NULL;
-}
-
-
diff --git a/web/server/multi/multi-threaded.h b/web/server/multi/multi-threaded.h
deleted file mode 100644
index d7ebf3c54..000000000
--- a/web/server/multi/multi-threaded.h
+++ /dev/null
@@ -1,10 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#ifndef NETDATA_WEB_SERVER_MULTI_THREADED_H
-#define NETDATA_WEB_SERVER_MULTI_THREADED_H
-
-#include "web/server/web_server.h"
-
-extern void *socket_listen_main_multi_threaded(void *ptr);
-
-#endif //NETDATA_WEB_SERVER_MULTI_THREADED_H
diff --git a/web/server/single/Makefile.am b/web/server/single/Makefile.am
deleted file mode 100644
index 90cc9ca1e..000000000
--- a/web/server/single/Makefile.am
+++ /dev/null
@@ -1,11 +0,0 @@
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-
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diff --git a/web/server/single/Makefile.in b/web/server/single/Makefile.in
deleted file mode 100644
index a8ae2a35b..000000000
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+++ /dev/null
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diff --git a/web/server/single/README.md b/web/server/single/README.md
deleted file mode 100644
index df5fe56e3..000000000
--- a/web/server/single/README.md
+++ /dev/null
@@ -1,6 +0,0 @@
-# `single-threaded` web server
-
-The `single-threaded` web server runs as a single thread inside netdata.
-It uses non-blocking I/O so it can serve any number of web requests in parallel.
-
-This web server respects the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection.
\ No newline at end of file
diff --git a/web/server/single/single-threaded.c b/web/server/single/single-threaded.c
deleted file mode 100644
index 7e89ee683..000000000
--- a/web/server/single/single-threaded.c
+++ /dev/null
@@ -1,194 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#define WEB_SERVER_INTERNALS 1
-#include "single-threaded.h"
-
-// --------------------------------------------------------------------------------------
-// the main socket listener - SINGLE-THREADED
-
-struct web_client *single_threaded_clients[FD_SETSIZE];
-
-static inline int single_threaded_link_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds, int *max) {
-    if(unlikely(web_client_check_dead(w) || (!web_client_has_wait_receive(w) && !web_client_has_wait_send(w)))) {
-        return 1;
-    }
-
-    if(unlikely(w->ifd < 0 || w->ifd >= (int)FD_SETSIZE || w->ofd < 0 || w->ofd >= (int)FD_SETSIZE)) {
-        error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd < FD_SETSIZE (%d)", w->id, w->ifd, w->ofd, (int)FD_SETSIZE);
-        return 1;
-    }
-
-    FD_SET(w->ifd, efds);
-    if(unlikely(*max < w->ifd)) *max = w->ifd;
-
-    if(unlikely(w->ifd != w->ofd)) {
-        if(*max < w->ofd) *max = w->ofd;
-        FD_SET(w->ofd, efds);
-    }
-
-    if(web_client_has_wait_receive(w)) FD_SET(w->ifd, ifds);
-    if(web_client_has_wait_send(w))    FD_SET(w->ofd, ofds);
-
-    single_threaded_clients[w->ifd] = w;
-    single_threaded_clients[w->ofd] = w;
-
-    return 0;
-}
-
-static inline int single_threaded_unlink_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds) {
-    FD_CLR(w->ifd, efds);
-    if(unlikely(w->ifd != w->ofd)) FD_CLR(w->ofd, efds);
-
-    if(web_client_has_wait_receive(w)) FD_CLR(w->ifd, ifds);
-    if(web_client_has_wait_send(w))    FD_CLR(w->ofd, ofds);
-
-    single_threaded_clients[w->ifd] = NULL;
-    single_threaded_clients[w->ofd] = NULL;
-
-    if(unlikely(web_client_check_dead(w) || (!web_client_has_wait_receive(w) && !web_client_has_wait_send(w)))) {
-        return 1;
-    }
-
-    return 0;
-}
-
-static void socket_listen_main_single_threaded_cleanup(void *data) {
-    struct netdata_static_thread *static_thread = (struct netdata_static_thread *)data;
-    static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
-
-    info("closing all sockets...");
-    listen_sockets_close(&api_sockets);
-
-    info("freeing web clients cache...");
-    web_client_cache_destroy();
-
-    info("cleanup completed.");
-    static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
-}
-
-void *socket_listen_main_single_threaded(void *ptr) {
-    netdata_thread_cleanup_push(socket_listen_main_single_threaded_cleanup, ptr);
-    web_server_mode = WEB_SERVER_MODE_SINGLE_THREADED;
-    web_server_is_multithreaded = 0;
-
-    struct web_client *w;
-
-    if(!api_sockets.opened)
-        fatal("LISTENER: no listen sockets available.");
-
-    size_t i;
-    for(i = 0; i < (size_t)FD_SETSIZE ; i++)
-        single_threaded_clients[i] = NULL;
-
-    fd_set ifds, ofds, efds, rifds, rofds, refds;
-    FD_ZERO (&ifds);
-    FD_ZERO (&ofds);
-    FD_ZERO (&efds);
-    int fdmax = 0;
-
-    for(i = 0; i < api_sockets.opened ; i++) {
-        if (api_sockets.fds[i] < 0 || api_sockets.fds[i] >= (int)FD_SETSIZE)
-            fatal("LISTENER: Listen socket %d is not ready, or invalid.", api_sockets.fds[i]);
-
-        info("Listening on '%s'", (api_sockets.fds_names[i])?api_sockets.fds_names[i]:"UNKNOWN");
-
-        FD_SET(api_sockets.fds[i], &ifds);
-        FD_SET(api_sockets.fds[i], &efds);
-        if(fdmax < api_sockets.fds[i])
-            fdmax = api_sockets.fds[i];
-    }
-
-    while(!netdata_exit) {
-        debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server waiting (fdmax = %d)...", fdmax);
-
-        struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };
-        rifds = ifds;
-        rofds = ofds;
-        refds = efds;
-        int retval = select(fdmax+1, &rifds, &rofds, &refds, &tv);
-
-        if(unlikely(retval == -1)) {
-            error("LISTENER: select() failed.");
-            continue;
-        }
-        else if(likely(retval)) {
-            debug(D_WEB_CLIENT_ACCESS, "LISTENER: got something.");
-
-            for(i = 0; i < api_sockets.opened ; i++) {
-                if (FD_ISSET(api_sockets.fds[i], &rifds)) {
-                    debug(D_WEB_CLIENT_ACCESS, "LISTENER: new connection.");
-                    w = web_client_create_on_listenfd(api_sockets.fds[i]);
-                    if(unlikely(!w))
-                        continue;
-
-                    if(api_sockets.fds_families[i] == AF_UNIX)
-                        web_client_set_unix(w);
-                    else
-                        web_client_set_tcp(w);
-
-                    if (single_threaded_link_client(w, &ifds, &ofds, &ifds, &fdmax) != 0) {
-                        web_client_release(w);
-                    }
-                }
-            }
-
-            for(i = 0 ; i <= (size_t)fdmax ; i++) {
-                if(likely(!FD_ISSET(i, &rifds) && !FD_ISSET(i, &rofds) && !FD_ISSET(i, &refds)))
-                    continue;
-
-                w = single_threaded_clients[i];
-                if(unlikely(!w)) {
-                    // error("no client on slot %zu", i);
-                    continue;
-                }
-
-                if(unlikely(single_threaded_unlink_client(w, &ifds, &ofds, &efds) != 0)) {
-                    // error("failed to unlink client %zu", i);
-                    web_client_release(w);
-                    continue;
-                }
-
-                if (unlikely(FD_ISSET(w->ifd, &refds) || FD_ISSET(w->ofd, &refds))) {
-                    // error("no input on client %zu", i);
-                    web_client_release(w);
-                    continue;
-                }
-
-                if (unlikely(web_client_has_wait_receive(w) && FD_ISSET(w->ifd, &rifds))) {
-                    if (unlikely(web_client_receive(w) < 0)) {
-                        // error("cannot read from client %zu", i);
-                        web_client_release(w);
-                        continue;
-                    }
-
-                    if (w->mode != WEB_CLIENT_MODE_FILECOPY) {
-                        debug(D_WEB_CLIENT, "%llu: Processing received data.", w->id);
-                        web_client_process_request(w);
-                    }
-                }
-
-                if (unlikely(web_client_has_wait_send(w) && FD_ISSET(w->ofd, &rofds))) {
-                    if (unlikely(web_client_send(w) < 0)) {
-                        // error("cannot send data to client %zu", i);
-                        debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
-                        web_client_release(w);
-                        continue;
-                    }
-                }
-
-                if(unlikely(single_threaded_link_client(w, &ifds, &ofds, &efds, &fdmax) != 0)) {
-                    // error("failed to link client %zu", i);
-                    web_client_release(w);
-                }
-            }
-        }
-        else {
-            debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server timeout.");
-        }
-    }
-
-    netdata_thread_cleanup_pop(1);
-    return NULL;
-}
-
-
diff --git a/web/server/single/single-threaded.h b/web/server/single/single-threaded.h
deleted file mode 100644
index fab4ceba1..000000000
--- a/web/server/single/single-threaded.h
+++ /dev/null
@@ -1,10 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#ifndef NETDATA_WEB_SERVER_SINGLE_THREADED_H
-#define NETDATA_WEB_SERVER_SINGLE_THREADED_H
-
-#include "web/server/web_server.h"
-
-extern void *socket_listen_main_single_threaded(void *ptr);
-
-#endif //NETDATA_WEB_SERVER_SINGLE_THREADED_H
diff --git a/web/server/static/Makefile.in b/web/server/static/Makefile.in
deleted file mode 100644
index f9dda4fa2..000000000
--- a/web/server/static/Makefile.in
+++ /dev/null
@@ -1,647 +0,0 @@
-# Makefile.in generated by automake 1.14.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994-2013 Free Software Foundation, Inc.
-
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# SPDX-License-Identifier: GPL-3.0-or-later
-
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-mostlyclean-am: mostlyclean-generic
-
-pdf: pdf-recursive
-
-pdf-am:
-
-ps: ps-recursive
-
-ps-am:
-
-uninstall-am:
-
-.MAKE: $(am__recursive_targets) install-am install-strip
-
-.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am check \
-	check-am clean clean-generic cscopelist-am ctags ctags-am \
-	distclean distclean-generic distclean-tags distdir dvi dvi-am \
-	html html-am info info-am install install-am install-data \
-	install-data-am install-dvi install-dvi-am install-exec \
-	install-exec-am install-html install-html-am install-info \
-	install-info-am install-man install-pdf install-pdf-am \
-	install-ps install-ps-am install-strip installcheck \
-	installcheck-am installdirs installdirs-am maintainer-clean \
-	maintainer-clean-generic mostlyclean mostlyclean-generic pdf \
-	pdf-am ps ps-am tags tags-am uninstall uninstall-am
-
-
-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/web/server/static/README.md b/web/server/static/README.md
index 16febdb32..653b364bc 100644
--- a/web/server/static/README.md
+++ b/web/server/static/README.md
@@ -6,4 +6,5 @@ The kernel distributes the incoming requests to them.
 
 Each thread uses non-blocking I/O so it can serve any number of web requests in parallel.
 
-This web server respects the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection. 
\ No newline at end of file
+This web server respects the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection. 
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fweb%2Fserver%2Fstatic%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/web/server/static/static-threaded.c b/web/server/static/static-threaded.c
index 56b8dbf8d..56e726ba1 100644
--- a/web/server/static/static-threaded.c
+++ b/web/server/static/static-threaded.c
@@ -3,10 +3,14 @@
 #define WEB_SERVER_INTERNALS 1
 #include "static-threaded.h"
 
+int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
+int web_client_first_request_timeout = DEFAULT_TIMEOUT_TO_RECEIVE_FIRST_WEB_REQUEST;
+long web_client_streaming_rate_t = 0L;
+
 // ----------------------------------------------------------------------------
 // high level web clients connection management
 
-static struct web_client *web_client_create_on_fd(int fd, const char *client_ip, const char *client_port) {
+static struct web_client *web_client_create_on_fd(int fd, const char *client_ip, const char *client_port, int port_acl) {
     struct web_client *w;
 
     w = web_client_get_from_cache_or_allocate();
@@ -17,6 +21,7 @@ static struct web_client *web_client_create_on_fd(int fd, const char *client_ip,
 
     if(unlikely(!*w->client_ip))   strcpy(w->client_ip,   "-");
     if(unlikely(!*w->client_port)) strcpy(w->client_port, "-");
+	w->port_acl = port_acl;
 
     web_client_initialize_connection(w);
     return(w);
@@ -44,6 +49,7 @@ struct web_server_static_threaded_worker {
 };
 
 static long long static_threaded_workers_count = 1;
+
 static struct web_server_static_threaded_worker *static_workers_private_data = NULL;
 static __thread struct web_server_static_threaded_worker *worker_private = NULL;
 
@@ -143,7 +149,7 @@ static void *web_server_add_callback(POLLINFO *pi, short int *events, void *data
     *events = POLLIN;
 
     debug(D_WEB_CLIENT_ACCESS, "LISTENER on %d: new connection.", pi->fd);
-    struct web_client *w = web_client_create_on_fd(pi->fd, pi->client_ip, pi->client_port);
+    struct web_client *w = web_client_create_on_fd(pi->fd, pi->client_ip, pi->client_port, pi->port_acl);
     w->pollinfo_slot = pi->slot;
 
     if(unlikely(pi->socktype == AF_UNIX))
@@ -200,6 +206,7 @@ static int web_server_rcv_callback(POLLINFO *pi, short int *events) {
                 POLLINFO *fpi = poll_add_fd(
                         pi->p
                         , w->ifd
+                        , pi->port_acl
                         , 0
                         , POLLINFO_FLAG_CLIENT_SOCKET
                         , "FILENAME"
@@ -394,7 +401,13 @@ void *socket_listen_main_static_threaded(void *ptr) {
             // so, if the machine has more CPUs, avoid using resources unnecessarily
             int def_thread_count = (processors > 6)?6:processors;
 
+            if (!strcmp(config_get(CONFIG_SECTION_WEB, "mode", ""),"single-threaded")) {
+                info("Running web server with one thread, because mode is single-threaded");
+                config_set(CONFIG_SECTION_WEB, "mode", "static-threaded");
+                def_thread_count = 1;
+            }
             static_threaded_workers_count = config_get_number(CONFIG_SECTION_WEB, "web server threads", def_thread_count);
+
             if(static_threaded_workers_count < 1) static_threaded_workers_count = 1;
 
             size_t max_sockets = (size_t)config_get_number(CONFIG_SECTION_WEB, "web server max sockets", (long long int)(rlimit_nofile.rlim_cur / 2));
diff --git a/web/server/web_client.c b/web/server/web_client.c
index 282cfcd1a..4e34ae3a3 100644
--- a/web/server/web_client.c
+++ b/web/server/web_client.c
@@ -157,6 +157,10 @@ void web_client_request_done(struct web_client *w) {
     w->origin[1] = '\0';
 
     freez(w->user_agent); w->user_agent = NULL;
+    if (w->auth_bearer_token) {
+        freez(w->auth_bearer_token);
+        w->auth_bearer_token = NULL;
+    }
 
     w->mode = WEB_CLIENT_MODE_NORMAL;
 
@@ -577,10 +581,17 @@ static inline int check_host_and_dashboard_acl_and_call(RRDHOST *host, struct we
     return check_host_and_call(host, w, url, func);
 }
 
+static inline int check_host_and_mgmt_acl_and_call(RRDHOST *host, struct web_client *w, char *url, int (*func)(RRDHOST *, struct web_client *, char *)) {
+    if(!web_client_can_access_mgmt(w))
+        return web_client_permission_denied(w);
+
+    return check_host_and_call(host, w, url, func);
+}
+
 int web_client_api_request(RRDHOST *host, struct web_client *w, char *url)
 {
     // get the api version
-    char *tok = mystrsep(&url, "/?&");
+    char *tok = mystrsep(&url, "/");
     if(tok && *tok) {
         debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
         if(strcmp(tok, "v1") == 0)
@@ -713,7 +724,7 @@ const char *web_response_code_to_string(int code) {
 }
 
 static inline char *http_header_parse(struct web_client *w, char *s, int parse_useragent) {
-    static uint32_t hash_origin = 0, hash_connection = 0, hash_accept_encoding = 0, hash_donottrack = 0, hash_useragent = 0;
+    static uint32_t hash_origin = 0, hash_connection = 0, hash_accept_encoding = 0, hash_donottrack = 0, hash_useragent = 0, hash_authorization = 0;
 
     if(unlikely(!hash_origin)) {
         hash_origin = simple_uhash("Origin");
@@ -721,6 +732,7 @@ static inline char *http_header_parse(struct web_client *w, char *s, int parse_u
         hash_accept_encoding = simple_uhash("Accept-Encoding");
         hash_donottrack = simple_uhash("DNT");
         hash_useragent = simple_uhash("User-Agent");
+        hash_authorization = simple_uhash("X-Auth-Token");
     }
 
     char *e = s;
@@ -765,6 +777,8 @@ static inline char *http_header_parse(struct web_client *w, char *s, int parse_u
     }
     else if(parse_useragent && hash == hash_useragent && !strcasecmp(s, "User-Agent")) {
         w->user_agent = strdupz(v);
+    } else if(hash == hash_authorization&& !strcasecmp(s, "X-Auth-Token")) {
+        w->auth_bearer_token = strdupz(v);
     }
 #ifdef NETDATA_WITH_ZLIB
     else if(hash == hash_accept_encoding && !strcasecmp(s, "Accept-Encoding")) {
@@ -1071,7 +1085,7 @@ static inline int web_client_switch_host(RRDHOST *host, struct web_client *w, ch
         return 400;
     }
 
-    char *tok = mystrsep(&url, "/?&");
+    char *tok = mystrsep(&url, "/");
     if(tok && *tok) {
         debug(D_WEB_CLIENT, "%llu: Searching for host with name '%s'.", w->id, tok);
 
@@ -1163,7 +1177,7 @@ static inline int web_client_process_url(RRDHOST *host, struct web_client *w, ch
             buffer_flush(w->response.data);
 
             // get the name of the data to show
-            tok = mystrsep(&url, "/?&");
+            tok = mystrsep(&url, "&");
             if(tok && *tok) {
                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
 
@@ -1239,9 +1253,15 @@ void web_client_process_request(struct web_client *w) {
                     return;
 
                 case WEB_CLIENT_MODE_OPTIONS:
-                    if(unlikely(!web_client_can_access_dashboard(w) && !web_client_can_access_registry(w) && !web_client_can_access_badges(w))) {
+                    if(unlikely(
+                            !web_client_can_access_dashboard(w) &&
+                            !web_client_can_access_registry(w) &&
+                            !web_client_can_access_badges(w) &&
+                            !web_client_can_access_mgmt(w) &&
+                            !web_client_can_access_netdataconf(w)
+                    )) {
                         web_client_permission_denied(w);
-                        return;
+                        break;
                     }
 
                     w->response.data->contenttype = CT_TEXT_PLAIN;
@@ -1252,9 +1272,15 @@ void web_client_process_request(struct web_client *w) {
 
                 case WEB_CLIENT_MODE_FILECOPY:
                 case WEB_CLIENT_MODE_NORMAL:
-                    if(unlikely(!web_client_can_access_dashboard(w) && !web_client_can_access_registry(w) && !web_client_can_access_badges(w))) {
+                    if(unlikely(
+                            !web_client_can_access_dashboard(w) &&
+                            !web_client_can_access_registry(w) &&
+                            !web_client_can_access_badges(w) &&
+                            !web_client_can_access_mgmt(w) &&
+                            !web_client_can_access_netdataconf(w)
+                    )) {
                         web_client_permission_denied(w);
-                        return;
+                        break;
                     }
 
                     w->response.code = web_client_process_url(localhost, w, w->decoded_url);
diff --git a/web/server/web_client.h b/web/server/web_client.h
index b9e528fca..4263e252a 100644
--- a/web/server/web_client.h
+++ b/web/server/web_client.h
@@ -108,31 +108,14 @@ struct response {
 
 };
 
-typedef enum web_client_acl {
-    WEB_CLIENT_ACL_NONE      = 0,
-    WEB_CLIENT_ACL_NOCHECK   = 0,
-    WEB_CLIENT_ACL_DASHBOARD = 1 << 0,
-    WEB_CLIENT_ACL_REGISTRY  = 1 << 1,
-    WEB_CLIENT_ACL_BADGE     = 1 << 2
-} WEB_CLIENT_ACL;
-
-#define web_client_can_access_dashboard(w) ((w)->acl & WEB_CLIENT_ACL_DASHBOARD)
-#define web_client_can_access_registry(w) ((w)->acl & WEB_CLIENT_ACL_REGISTRY)
-#define web_client_can_access_badges(w) ((w)->acl & WEB_CLIENT_ACL_BADGE)
-
-#define web_client_can_access_stream(w) \
-    (!web_allow_streaming_from || simple_pattern_matches(web_allow_streaming_from, (w)->client_ip))
-
-#define web_client_can_access_netdataconf(w) \
-    (!web_allow_netdataconf_from || simple_pattern_matches(web_allow_netdataconf_from, (w)->client_ip))
-
 struct web_client {
     unsigned long long id;
 
     WEB_CLIENT_FLAGS flags;         // status flags for the client
     WEB_CLIENT_MODE mode;           // the operational mode of the client
     WEB_CLIENT_ACL acl;             // the access list of the client
-
+    int port_acl;                   // the operations permitted on the port the client connected to
+    char *auth_bearer_token;        // the Bearer auth token (if sent)
     size_t header_parse_tries;
     size_t header_parse_last_size;
 
diff --git a/web/server/web_server.c b/web/server/web_server.c
index 5a68b125e..11f7edf8a 100644
--- a/web/server/web_server.c
+++ b/web/server/web_server.c
@@ -3,12 +3,6 @@
 #define WEB_SERVER_INTERNALS 1
 #include "web_server.h"
 
-// this file includes 3 web servers:
-//
-// 1. single-threaded, based on select()
-// 2. multi-threaded, based on poll() that spawns threads to handle the requests, based on select()
-// 3. static-threaded, based on poll() using a fixed number of threads (configured at netdata.conf)
-
 WEB_SERVER_MODE web_server_mode = WEB_SERVER_MODE_STATIC_THREADED;
 
 // --------------------------------------------------------------------------------------
@@ -16,28 +10,18 @@ WEB_SERVER_MODE web_server_mode = WEB_SERVER_MODE_STATIC_THREADED;
 WEB_SERVER_MODE web_server_mode_id(const char *mode) {
     if(!strcmp(mode, "none"))
         return WEB_SERVER_MODE_NONE;
-    else if(!strcmp(mode, "single") || !strcmp(mode, "single-threaded"))
-        return WEB_SERVER_MODE_SINGLE_THREADED;
-    else if(!strcmp(mode, "static") || !strcmp(mode, "static-threaded"))
+    else
         return WEB_SERVER_MODE_STATIC_THREADED;
-    else // if(!strcmp(mode, "multi") || !strcmp(mode, "multi-threaded"))
-        return WEB_SERVER_MODE_MULTI_THREADED;
+
 }
 
 const char *web_server_mode_name(WEB_SERVER_MODE id) {
     switch(id) {
         case WEB_SERVER_MODE_NONE:
             return "none";
-
-        case WEB_SERVER_MODE_SINGLE_THREADED:
-            return "single-threaded";
-
+        default:
         case WEB_SERVER_MODE_STATIC_THREADED:
             return "static-threaded";
-
-        default:
-        case WEB_SERVER_MODE_MULTI_THREADED:
-            return "multi-threaded";
     }
 }
 
@@ -45,20 +29,44 @@ const char *web_server_mode_name(WEB_SERVER_MODE id) {
 // API sockets
 
 LISTEN_SOCKETS api_sockets = {
-        .config          = &netdata_config,
-        .config_section  = CONFIG_SECTION_WEB,
-        .default_bind_to = "*",
-        .default_port    = API_LISTEN_PORT,
-        .backlog         = API_LISTEN_BACKLOG
+		.config          = &netdata_config,
+		.config_section  = CONFIG_SECTION_WEB,
+		.default_bind_to = "*",
+		.default_port    = API_LISTEN_PORT,
+		.backlog         = API_LISTEN_BACKLOG
 };
 
-int api_listen_sockets_setup(void) {
-    int socks = listen_sockets_setup(&api_sockets);
+void debug_sockets() {
+	BUFFER *wb = buffer_create(256 * sizeof(char));
+	int i;
+
+	for(i = 0 ; i < (int)api_sockets.opened ; i++) {
+		buffer_strcat(wb, (api_sockets.fds_acl_flags[i] & WEB_CLIENT_ACL_NOCHECK)?"NONE ":"");
+		buffer_strcat(wb, (api_sockets.fds_acl_flags[i] & WEB_CLIENT_ACL_DASHBOARD)?"dashboard ":"");
+		buffer_strcat(wb, (api_sockets.fds_acl_flags[i] & WEB_CLIENT_ACL_REGISTRY)?"registry ":"");
+		buffer_strcat(wb, (api_sockets.fds_acl_flags[i] & WEB_CLIENT_ACL_BADGE)?"badges ":"");
+		buffer_strcat(wb, (api_sockets.fds_acl_flags[i] & WEB_CLIENT_ACL_MGMT)?"management ":"");
+		buffer_strcat(wb, (api_sockets.fds_acl_flags[i] & WEB_CLIENT_ACL_STREAMING)?"streaming ":"");
+		buffer_strcat(wb, (api_sockets.fds_acl_flags[i] & WEB_CLIENT_ACL_NETDATACONF)?"netdata.conf ":"");
+		debug(D_WEB_CLIENT, "Socket fd %d name '%s' acl_flags: %s",
+			  i,
+			  api_sockets.fds_names[i],
+			  buffer_tostring(wb));
+		buffer_reset(wb);
+	}
+	buffer_free(wb);
+}
+
+void api_listen_sockets_setup(void) {
+	int socks = listen_sockets_setup(&api_sockets);
+
+	if(!socks)
+		fatal("LISTENER: Cannot listen on any API socket. Exiting...");
 
-    if(!socks)
-        fatal("LISTENER: Cannot listen on any API socket. Exiting...");
+	if(unlikely(debug_flags & D_WEB_CLIENT))
+		debug_sockets();
 
-    return socks;
+	return;
 }
 
 
@@ -66,13 +74,14 @@ int api_listen_sockets_setup(void) {
 // access lists
 
 SIMPLE_PATTERN *web_allow_connections_from = NULL;
-SIMPLE_PATTERN *web_allow_streaming_from = NULL;
-SIMPLE_PATTERN *web_allow_netdataconf_from = NULL;
 
 // WEB_CLIENT_ACL
 SIMPLE_PATTERN *web_allow_dashboard_from = NULL;
 SIMPLE_PATTERN *web_allow_registry_from = NULL;
 SIMPLE_PATTERN *web_allow_badges_from = NULL;
+SIMPLE_PATTERN *web_allow_mgmt_from = NULL;
+SIMPLE_PATTERN *web_allow_streaming_from = NULL;
+SIMPLE_PATTERN *web_allow_netdataconf_from = NULL;
 
 void web_client_update_acl_matches(struct web_client *w) {
     w->acl = WEB_CLIENT_ACL_NONE;
@@ -85,6 +94,17 @@ void web_client_update_acl_matches(struct web_client *w) {
 
     if(!web_allow_badges_from || simple_pattern_matches(web_allow_badges_from, w->client_ip))
         w->acl |= WEB_CLIENT_ACL_BADGE;
+
+    if(!web_allow_mgmt_from || simple_pattern_matches(web_allow_mgmt_from, w->client_ip))
+        w->acl |= WEB_CLIENT_ACL_MGMT;
+
+    if(!web_allow_streaming_from || simple_pattern_matches(web_allow_streaming_from, w->client_ip))
+        w->acl |= WEB_CLIENT_ACL_STREAMING;
+
+    if(!web_allow_netdataconf_from || simple_pattern_matches(web_allow_netdataconf_from, w->client_ip))
+        w->acl |= WEB_CLIENT_ACL_NETDATACONF;
+
+    w->acl &= w->port_acl;
 }
 
 
@@ -119,28 +139,4 @@ void web_client_initialize_connection(struct web_client *w) {
     web_client_cache_verify(0);
 }
 
-struct web_client *web_client_create_on_listenfd(int listener) {
-    struct web_client *w;
-
-    w = web_client_get_from_cache_or_allocate();
-    w->ifd = w->ofd = accept_socket(listener, SOCK_NONBLOCK, w->client_ip, sizeof(w->client_ip), w->client_port, sizeof(w->client_port), web_allow_connections_from);
-
-    if(unlikely(!*w->client_ip))   strcpy(w->client_ip,   "-");
-    if(unlikely(!*w->client_port)) strcpy(w->client_port, "-");
-
-    if (w->ifd == -1) {
-        if(errno == EPERM)
-            web_server_log_connection(w, "ACCESS DENIED");
-        else {
-            web_server_log_connection(w, "CONNECTION FAILED");
-            error("%llu: Failed to accept new incoming connection.", w->id);
-        }
-
-        web_client_release(w);
-        return NULL;
-    }
-
-    web_client_initialize_connection(w);
-    return(w);
-}
 
diff --git a/web/server/web_server.h b/web/server/web_server.h
index 7777c8978..e7c2dd448 100644
--- a/web/server/web_server.h
+++ b/web/server/web_server.h
@@ -15,9 +15,7 @@
 #endif
 
 typedef enum web_server_mode {
-    WEB_SERVER_MODE_SINGLE_THREADED,
     WEB_SERVER_MODE_STATIC_THREADED,
-    WEB_SERVER_MODE_MULTI_THREADED,
     WEB_SERVER_MODE_NONE
 } WEB_SERVER_MODE;
 
@@ -27,13 +25,14 @@ extern SIMPLE_PATTERN *web_allow_registry_from;
 extern SIMPLE_PATTERN *web_allow_badges_from;
 extern SIMPLE_PATTERN *web_allow_streaming_from;
 extern SIMPLE_PATTERN *web_allow_netdataconf_from;
+extern SIMPLE_PATTERN *web_allow_mgmt_from;
 
 extern WEB_SERVER_MODE web_server_mode;
 
 extern WEB_SERVER_MODE web_server_mode_id(const char *mode);
 extern const char *web_server_mode_name(WEB_SERVER_MODE id);
 
-extern int api_listen_sockets_setup(void);
+extern void api_listen_sockets_setup(void);
 
 #define DEFAULT_TIMEOUT_TO_RECEIVE_FIRST_WEB_REQUEST 60
 #define DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS 60
@@ -51,8 +50,6 @@ extern struct web_client *web_client_create_on_listenfd(int listener);
 #include "web_client_cache.h"
 #endif // WEB_SERVER_INTERNALS
 
-#include "single/single-threaded.h"
-#include "multi/multi-threaded.h"
 #include "static/static-threaded.h"
 
 #include "daemon/common.h"